2018-01-02

• Uptime Robot noticed that CGSpace went down and up a few times last night, for a few minutes each time
• I didn't get any load alerts from Linode and the REST and XMLUI logs don't show anything out of the ordinary
• The nginx logs show HTTP 200s until 02/Jan/2018:11:27:17 +0000 when Uptime Robot got an HTTP 500
• In dspace.log around that time I see many errors like "Client closed the connection before file download was complete"
• And just before that I see this:

Caused by: org.apache.tomcat.jdbc.pool.PoolExhaustedException: [http-bio-127.0.0.1-8443-exec-980] Timeout: Pool empty. Unable to fetch a connection in 5 seconds, none available[size:50; busy:50; idle:0; lastwait:5000].

• Ah hah! So the pool was actually empty!
• I need to increase that, let's try to bump it up from 50 to 75
• After that one client got an HTTP 499 but then the rest were HTTP 200, so I don't know what the hell Uptime Robot saw
• I notice this error quite a few times in dspace.log:

2018-01-02 01:21:19,137 ERROR org.dspace.app.xmlui.aspect.discovery.SidebarFacetsTransformer @ Error while searching for sidebar facets
org.dspace.discovery.SearchServiceException: org.apache.solr.search.SyntaxError: Cannot parse 'dateIssued_keyword:[1976+TO+1979]': Encountered " "]" "] "" at line 1, column 32.

• And there are many of these errors every day for the past month:

$ grep -c "Error while searching for sidebar facets" dspace.log.*
dspace.log.2017-11-21:4
dspace.log.2017-11-22:1
dspace.log.2017-11-23:4
dspace.log.2017-11-24:11
dspace.log.2017-11-25:0
dspace.log.2017-11-26:1
dspace.log.2017-11-27:7
dspace.log.2017-11-28:21
dspace.log.2017-11-29:31
dspace.log.2017-11-30:15
dspace.log.2017-12-01:15
dspace.log.2017-12-02:20
dspace.log.2017-12-03:38
dspace.log.2017-12-04:65
dspace.log.2017-12-05:43
dspace.log.2017-12-06:72
dspace.log.2017-12-07:27
dspace.log.2017-12-08:15
dspace.log.2017-12-09:29
dspace.log.2017-12-10:35
dspace.log.2017-12-11:20
dspace.log.2017-12-12:44
dspace.log.2017-12-13:36
dspace.log.2017-12-14:59
dspace.log.2017-12-15:104
dspace.log.2017-12-16:53
dspace.log.2017-12-17:66
dspace.log.2017-12-18:83
dspace.log.2017-12-19:101
dspace.log.2017-12-20:74
dspace.log.2017-12-21:55
dspace.log.2017-12-22:66
dspace.log.2017-12-23:50
dspace.log.2017-12-24:85
dspace.log.2017-12-25:62
dspace.log.2017-12-26:49
dspace.log.2017-12-27:30
dspace.log.2017-12-28:54
dspace.log.2017-12-29:68
dspace.log.2017-12-30:89
dspace.log.2017-12-31:53
dspace.log.2018-01-01:45
dspace.log.2018-01-02:34

• Danny wrote to ask for help renewing the wildcard ilri.org certificate and I advised that we should probably use Let's Encrypt if it's just a handful of domains

2018-01-03

• I woke up to more up and down of CGSpace, this time UptimeRobot noticed a few rounds of up and down of a few minutes each and Linode also notified of high CPU load from 12 to 2 PM
• Looks like I need to increase the database pool size again:

$ grep -c "Timeout: Pool empty." dspace.log.2018-01-*
dspace.log.2018-01-01:0
dspace.log.2018-01-02:1972
dspace.log.2018-01-03:1909

• For some reason there were a lot of "active" connections last night:

• The active IPs in XMLUI are:

# cat /var/log/nginx/access.log /var/log/nginx/access.log.1 /var/log/nginx/library-access.log /var/log/nginx/library-access.log.1 | grep -E "3/Jan/2018" | awk '{print $1}' | sort -n | uniq -c | sort -h | tail
    607 40.77.167.141
    611 2a00:23c3:8c94:7800:392c:a491:e796:9c50
    663 188.226.169.37
    759 157.55.39.245
    887 68.180.229.254
   1037 157.55.39.175
   1068 216.244.66.245
   1495 66.249.64.91
   1934 104.196.152.243
   2219 134.155.96.78

• 134.155.96.78 appears to be at the University of Mannheim in Germany
• They identify as: Mozilla/5.0 (compatible; heritrix/3.2.0 +http://ifm.uni-mannheim.de)
• This appears to be the Internet Archive's open source bot
• They seem to be re-using their Tomcat session so I don't need to do anything to them just yet:

$ grep 134.155.96.78 dspace.log.2018-01-03 | grep -o -E 'session_id=[A-Z0-9]{32}' | sort -n | uniq | wc -l
2

• The API logs show the normal users:

# cat /var/log/nginx/rest.log /var/log/nginx/rest.log.1 /var/log/nginx/oai.log /var/log/nginx/oai.log.1 | grep -E "3/Jan/2018" | awk '{print $1}' | sort -n | uniq -c | sort -h | tail
     32 207.46.13.182
     38 40.77.167.132
     38 68.180.229.254
     43 66.249.64.91
     46 40.77.167.141
     49 157.55.39.245
     79 157.55.39.175
   1533 50.116.102.77
   4069 70.32.83.92
   9355 45.5.184.196

• In other related news I see a sizeable amount of requests coming from python-requests
• For example, just in the last day there were 1700!

# cat /var/log/nginx/access.log /var/log/nginx/access.log.1 /var/log/nginx/library-access.log /var/log/nginx/library-access.log.1 | grep -c python-requests
1773

• But they come from hundreds of IPs, many of which are 54.x.x.x:

# cat /var/log/nginx/access.log /var/log/nginx/access.log.1 /var/log/nginx/library-access.log /var/log/nginx/library-access.log.1 | grep python-requests | awk '{print $1}' | sort -n | uniq -c | sort -h | tail -n 30
      9 54.144.87.92
      9 54.146.222.143
      9 54.146.249.249
      9 54.158.139.206
      9 54.161.235.224
      9 54.163.41.19
      9 54.163.4.51
      9 54.196.195.107
      9 54.198.89.134
      9 54.80.158.113
     10 54.198.171.98
     10 54.224.53.185
     10 54.226.55.207
     10 54.227.8.195
     10 54.242.234.189
     10 54.242.238.209
     10 54.80.100.66
     11 54.161.243.121
     11 54.205.154.178
     11 54.234.225.84
     11 54.87.23.173
     11 54.90.206.30
     12 54.196.127.62
     12 54.224.242.208
     12 54.226.199.163
     13 54.162.149.249
     13 54.211.182.255
     19 50.17.61.150
     21 54.211.119.107
    139 164.39.7.62

• I have no idea what these are but they seem to be coming from Amazon...
• I guess for now I just have to increase the database connection pool's max active
• It's currently 75 and normally I'd just bump it by 25 but let me be a bit daring and push it by 50 to 125, because I used to see at least 121 connections in pg_stat_activity before when we were using the shitty default pooling

2018-01-04

• CGSpace went down and up a bunch of times last night and ILRI staff were complaining a lot last night
• The XMLUI logs show this activity:

# cat /var/log/nginx/access.log /var/log/nginx/access.log.1 /var/log/nginx/library-access.log /var/log/nginx/library-access.log.1 | grep -E "4/Jan/2018" | awk '{print $1}' | sort -n | uniq -c | sort -h | tail
    968 197.211.63.81
    981 213.55.99.121
   1039 66.249.64.93
   1258 157.55.39.175
   1273 207.46.13.182
   1311 157.55.39.191
   1319 157.55.39.197
   1775 66.249.64.78
   2216 104.196.152.243
   3366 66.249.64.91

• Again we ran out of PostgreSQL database connections, even after bumping the pool max active limit from 50 to 75 to 125 yesterday!

2018-01-04 07:36:08,089 ERROR org.dspace.storage.rdbms.DatabaseManager @ SQL connection Error -
org.apache.tomcat.jdbc.pool.PoolExhaustedException: [http-bio-127.0.0.1-8443-exec-256] Timeout: Pool empty. Unable to fetch a connection in 5 seconds, none available[size:125; busy:125; idle:0; lastwait:5000].

• So for this week that is the number one problem!

$ grep -c "Timeout: Pool empty." dspace.log.2018-01-*
dspace.log.2018-01-01:0
dspace.log.2018-01-02:1972
dspace.log.2018-01-03:1909
dspace.log.2018-01-04:1559

• I will just bump the connection limit to 300 because I'm fucking fed up with this shit
• Once I get back to Amman I will have to try to create different database pools for different web applications, like recently discussed on the dspace-tech mailing list
• Create accounts on CGSpace for two CTA staff km4ard@cta.int and bheenick@cta.int

2018-01-05

• Peter said that CGSpac was down last night and Tsega restarted Tomcat
• I don't see any alerts from Linode or UptimeRobot, and there are no PostgreSQL connection errors in the dspace logs for today:

$ grep -c "Timeout: Pool empty." dspace.log.2018-01-*
dspace.log.2018-01-01:0
dspace.log.2018-01-02:1972
dspace.log.2018-01-03:1909
dspace.log.2018-01-04:1559
dspace.log.2018-01-05:0

• Daniel asked for help with their DAGRIS server (linode2328112) that has no disk space
• I had a look and there is one Apache 2 log file that is 73GB, with lots of this:

[Fri Jan 05 09:31:22.965398 2018] [:error] [pid 9340] [client 213.55.99.121:64476] WARNING: Unable to find a match for "9-16-1-RV.doc" in "/home/files/journals/6//articles/9/". Skipping this file., referer: http://dagris.info/reviewtool/index.php/index/install/upgrade

• I will delete the log file for now and tell Danny
• Also, I'm still seeing a hundred or so of the "ERROR org.dspace.app.xmlui.aspect.discovery.SidebarFacetsTransformer" errors in dspace logs, I need to search the dspace-tech mailing list to see what the cause is
• I will run a full Discovery reindex in the mean time to see if it's something wrong with the Discovery Solr core

$ export JAVA_OPTS="-Dfile.encoding=UTF-8 -Xmx512m -XX:+TieredCompilation -XX:TieredStopAtLevel=1"
$ time schedtool -D -e ionice -c2 -n7 nice -n19 [dspace]/bin/dspace index-discovery -b

real    110m43.985s
user    15m24.960s
sys     3m14.890s

• Reboot CGSpace and DSpace Test for new kernels (4.14.12-x86_64-linode92) that partially mitigate the Spectre and Meltdown CPU vulnerabilities